Electric bell or like device.



PATENTED SEPT. 5, 1905.

ANo. 799,016.

C. J.-SCHWARZE.

ELECTRIC BELL 0R LIKE DEVICE.

APPLICATION FILED MAY 31, 1904.

WOW

UNITED STATES PATENT OFFICE.

CARL J. SCHWARZE, OF ADRIAN, MICHIGAN, ASSIGNOR TO SCHlVARZE ELECTRIC COMPANY, OF ADRIAN, MICHIGAN, A CORPORATION OF MICHIGAN.

ELECTRIC BELL OR LIKE DEVICE.

Specification of Letters Patent.

Patented Sept. 5, 1905.

To all whom t may concern:

Be itknown thatI, CARL J. Sornvanzna citi- Zen of the United States, residing' at Adrian, in the county of Lenawee and State of Michigan, have invented a certain new and useful Improvement in Electric Bells or Like Devices, of which the following is a full, clear, concise, and exact description, reference be ingl had to the accompanying drawings, forming a part of this specification.

My invention relates to electric call-bells and like devices, and particularly to a construction thereof involving a pair of electromagnets arranged side by side and a vibratory armature actuated by said magnets.

Prominent objects of the invention are to provide a durable and inexpensive construction of devices of this kind, to increase to the maximum the efficiency of operation, and to accomplish the above results in a practical and expeditious manner.

The present invention is shown embodied in a vibratory call-bell, although it is understood that it can be embodied in other devices of the same general character as well.

In the accompanying drawings, Figure 1 is a front elevation of a vibratory call-bell embodying the invention. Fig. 2 is a top plan of the same, and Fig. 3 is a diagrammatic view of a part of the bell and its circuit connections.

The device which is shown in the drawings for carrying' out the invention comprises a frame conveniently consisting' of an upper strip or plate 1, a pair of side rods 2 2, secured to the ends of the plate 1 by nuts 3 3, and magnet support-s or holders 4 4, fitted on the lower ends of the rods 2 2 and secured thereto by nuts 5 5. The magnet-supports 4 4 are made of magnetic material, preferably iron, and are provided with upwardlyextending ends or portions 6 6, which are secured together and held in position by a strip plate 1 is provided with front and back overhangs 10 and 11, and avibratory armature 12 is pivotally supported by such overhangs. This general construction of frame and magnets, it will be seen, provides an arrangement by which two nearly or substantially closed magnetic circuits are provided for the two magnets, each of these consisting of a magnet-core, a portion of the member 4, the upright 6 thereof, and the portion of the armature 12 between such upright and the magnet-core. The insulating-strip 7 separates the magnetic circuits of the two magnets, whereby the efficiency and effectiveness of the device is greatly enhanced. Furthermore, the side rods 2 2 etfectively complete and brace the frame, and as they are of non-magnetic material no leakage of magnetic lines of force occurs in or through them.

In an application tiled by me July 25, 1902, Serial No. 117,032, I show and describe an electric vibratory call bell having certain novel features of construction and operation, and in the present application I show certain of the broader features of the invention of said other application applied to the present and hereinabove set forth construction, although it will be understood that said construction is useful in connection with other arrangements. To operate in accordance with the invention of my said other application, the armature 12 is provided with a metallic strip 13, the opposite ends of which are adapted to provide contacts. A pair of contact-screws 14 and 14 is mounted in the top plate 1, but insulated therefrom by insulatingdisks 15 15 and threaded bushings 16 16, extended through the same. Set-nuts 18 18 are provided for the attachment of conductors. The contact-screws 14 and 14u are mounted in such position that their lower ends, which project through the top plate 1, the insulation 15, and the threaded bushing 16, are over the opposite ends of the contact-strip 13. They are so adjusted that when the armature 12 is vibrated to one side-for example, with its right-hand end down and its left-hand end up, as shown in Fig. l-the contact-strip 13 will make contact with the screw 14 and be out of contact with the screw 14, whereas when the armature is vibrated to an opposite position the strip 13 will make contact with the screw 14u and be out of contact with the screw 14. A wire connection 12*L is shown extended between the top 1 and the armature 12 to insure good electrical connection between said armature and the frame of the device. The armature 12 carries a pendant o1' IOO IOS

arm 20, provided with a ball or lrnob 21 for striking the bell.

The coils 22 and 22, Fig. 3, of the magnets 8 and 8 are connected in shunt with the circuit 25, which is shown as an operating-circuit for operating the bell. This shunt connection consists in connecting the two coils with one another and with the opposite sides of the circuit and also in connecting said oplposite sides of the circuit by conductors 24 and 24u with the contact screws 14 and 14a. The armature 12 in vibrating causes Yits contact-strip 18 to make and break connection with the contact screws 14 and 14, whereby first one magnet and then the other is energized. The circuit 25 is shown with a pushbutton 28 for closing the circuit through the bell. rl`he magnets 8 and 8* are provided with closed or short-circuited induction-coils 26 26, which tend to suppress sparks in the operation of the device and increase the eficiency of its operation.

It will be understood that changes and modiiications can be made in the device herein shown without departing from the spirit of my invention, and, furthermore, that the invention herein set forth can be applied to devices other than call-bells, as herein shown.

What I claim as my invention is 1. The combination with a pair of magnetic devices arranged side by side, of an armature therefor, means for forming continuous magnetic return-paths around said magnetic devices, open at said armature,land a strip of non-magnetic material interposed between the means forming said magnetic paths, substantially as described.

2. The combination with a pair of electromagnets, of bars of magnetic material connected with the cores thereof and extended lengthwise of the magnets between the same, a strip of non-magnetic material interposed between said bars, and an armature for said electromagnets, substantially as described.

3. rlhe combination with a pair of electromagnets arranged side by side, of a vibratory armature therefor, bars of magnetic material connected with the cores of said magnets, and extended lengthwise of the magnets between the same, a strip of non-magnetic material interposed between said magnets and the bars between the same, means for changing the circuit connections so as to cause the said magnets to vibrate said armature, and closed secondary coils on said magnets, substantiall y as described.

4. The combination with a pair of electromagnets, of an armature, supports for said magnets, which supports are made of magnetic material and provided with portions extending between the magnets and forming continuous magnetic return-paths to the armature, non-magnetic material interposed between said magnetic paths, and a frame carrying said magnetic supports, thevparts of said frame connected therewith being of nonmagnetic material, substantially as described.

5. The combination of a pair of electromagnets arranged side by side, a vibratory armature therefor, supports for said magnets, consisting of bars of magnetic material connected with the cores of said magnets, and extended lengthwise between the same to substantially the armature, a strip of non-magnetic material interposed between the longitudinally-extending portions of said magnetsupports, a frame comprising a top carrying said armature, rods of non-magnetic material connecting said top and said magnet-supports, and cooperating contact members on the top and on said armature for controlling the circuit connections to said magnets to cause the vibration of the armature, substantially as described.

In witness whereof I hereunto subscribe my name this 9th day of May, A. D. 1904.

CARL J. SCHWARZE. Witnesses: Y

WALTER E. CooK, JENNIE C. Woon. 

